Ignition and control system for fragmented wood-type fuel furnac

Details Ignition and control system for fragmented wood-type fuel furnac Ignition and control system for fragmented wood-type fuel furnac

1982-03-11

1984-06-19

Yuen, Henry C.

Furnaces

Combined

With boiler

110102, 110190, 110101C, 126 25B, F23G 700

Patent

active

044548273

ABSTRACT:
A furnace system for automatic, continuous and efficient burning of fragmented wood-type fuel incorporates a wood-type fuel combustion chamber, a fragmented wood-type fuel feeder or conveyor for trickle feeding fuel into the chamber at selected uniform rates, a heat exchanger or heat exchange plenum, igniter for igniting the fuel fragments supported in the combustion chamber, a flame sensor mounted relative to the combustion chamber for sensing the presence of flames from fuel supported in the combustion chamber, one or more blowers providing forced air or forced draft, and a control circuit for controlling and sequencing operation of the elements for the furnace system and for operatively coupling the flame sensor and igniter for switching off the igniter upon sensing of flames from the wood-type fuel. An electric igniter is disclosed having a heating element for achieving flash point temperatures of fuel to be ignited, a shroud enclosing the heating element and communicating with the combustion chamber adjacent the fuel at a downwardly directed angle and a blower at the other end of the shroud for delivering air over the heating element. Two flame sensors are provided, for sensing the presence of flames from above and from the side.

REFERENCES:
patent: 2154787 (1939-04-01), Teeple
patent: 2176009 (1939-10-01), Lange
patent: 2192732 (1940-03-01), Johnson
patent: 2228751 (1941-01-01), Bros
patent: 2385811 (1945-10-01), Hotchkiss
patent: 3903814 (1975-09-01), Altekruse
patent: 4027602 (1977-06-01), Mott

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